# Stoichiometry Pro vs Stoichiometric equations

The clearest difference is price: Stoichiometric equations at Free against Stoichiometry Pro's $3.99. Stoichiometric equations also leads on device support (4 vs 2) and iOS requirement (15.0 vs 17.0). On update cadence, ads and in-app purchases there is nothing between them.

Stoichiometric equations is free to download; Stoichiometry Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stoichiometry Pro ships an update every 4 months, Stoichiometric equations every 3 months. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Stoichiometry Pro | Stoichiometric equations |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Size | 2 MB | 17 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 9+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Peter Sauer](https://appshunter.io/developer/1789152060) |

## What reviewers say

### Stoichiometry Pro

[App page](https://appshunter.io/ios/app/stoichiometry-pro/id1546919546)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Stoichiometric equations

[App page](https://appshunter.io/ios/app/stoichiometric-equations/id6740244756)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Stoichiometry Pro free?

Stoichiometry Pro costs $3.99, with no in-app purchases.

### Is Stoichiometric equations free?

Stoichiometric equations is free to download, with no in-app purchases.

### Do Stoichiometry Pro or Stoichiometric equations have ads?

Neither Stoichiometry Pro nor Stoichiometric equations shows ads.

### Which is updated more often, Stoichiometry Pro or Stoichiometric equations?

Stoichiometry Pro ships an update every 4 months, and Stoichiometric equations every 3 months. Most recently, Stoichiometry Pro was updated on November 3, 2026 and Stoichiometric equations on November 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*